825921539 has 2 divisors, whose sum is σ = 825921540. Its totient is φ = 825921538.

The previous prime is 825921521. The next prime is 825921611. The reversal of 825921539 is 935129528.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825921539 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 825921539.

It is not a weakly prime, because it can be changed into another prime (825921739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412960769 + 412960770.

It is an arithmetic number, because the mean of its divisors is an integer number (412960770).

Almost surely, 2^825921539 is an apocalyptic number.

825921539 is a deficient number, since it is larger than the sum of its proper divisors (1).

825921539 is an equidigital number, since it uses as much as digits as its factorization.

825921539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 825921539 is about 28738.8506903112. The cubic root of 825921539 is about 938.2378102801.

The spelling of 825921539 in words is "eight hundred twenty-five million, nine hundred twenty-one thousand, five hundred thirty-nine".